The design, synthesis and properties of liquid-crystalline semiconducting oligothiophenes containing dithienothiophene (DTT), benzothiadiazole (BTZ)and carbazole (CBZ) rigid cores are described. The effect of molecular structure (shape, size and substitution)on their thermal behaviour and electrical properties has been investigated. Polarised optical microscopy (POM)and differential scanning calorimetry (DSC)analy ses have revealed highly ordered smectic mesophases for most of the newly synthesised compounds. X-ray diffraction (XRD)studies performed at various temperatures have shown that the smectic order is retained in the crystalline state upon cooling across the transition temperature, affording cast films with a more favourable morphology for FET applications.
Liquid-crystalline rigid-core semiconductor oligothiophenes: influence of Molecular structure on phase behaviour and thin film properties
M Melucci;L Favaretto;C Bettini;M Gazzano;N Camaioni;Piera Maccagnani;G Barbarella
2007
Abstract
The design, synthesis and properties of liquid-crystalline semiconducting oligothiophenes containing dithienothiophene (DTT), benzothiadiazole (BTZ)and carbazole (CBZ) rigid cores are described. The effect of molecular structure (shape, size and substitution)on their thermal behaviour and electrical properties has been investigated. Polarised optical microscopy (POM)and differential scanning calorimetry (DSC)analy ses have revealed highly ordered smectic mesophases for most of the newly synthesised compounds. X-ray diffraction (XRD)studies performed at various temperatures have shown that the smectic order is retained in the crystalline state upon cooling across the transition temperature, affording cast films with a more favourable morphology for FET applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
